//
//  NSString+extention.m
//  demo
//
//  Created by zhouxiaobo on 15/10/22.
//  Copyright © 2015年 mapath. All rights reserved.
//

#import "NSString+extention.h"

@implementation NSString (extention)
+(NSString *) returnCostant{
    return @"这是一个字符串常量";
}
@end
